How to remove your Line account
In the app, you should be able to delete your account (settings or the like). If that doesn’t work however, contact the Line makers using: https://line.naver.jp/cs/en/
Fill in the appropriate fields and explain your story/request. In their ToS/PP it is clearly stated that closure of your account/data is a true removal. No turning back!
Helpful Trick: Removing online data
Helpful Trick: Remove third-party logins
If you signed up for Line using a third-party login such as Facebook or Twitter, you probably want to revoke all access from Line. Click here to find out how.